Pub Date : 2007-03-28DOI: 10.1109/INICA.2007.4353954
A. Abdulhadi, Abdel-Razik Sebak
A novel design of a circular microstrip antenna patch with an additional patch is presented for achieving circular polarization (CP). A comparison between theory and experimental results gives a good agreement. Sixty four elements of uniform linear array is designed and simulated for achieving CP with more than (20 dB) directivity.
{"title":"Single Feed Circularly Polarized Microstrip Antenna Array","authors":"A. Abdulhadi, Abdel-Razik Sebak","doi":"10.1109/INICA.2007.4353954","DOIUrl":"https://doi.org/10.1109/INICA.2007.4353954","url":null,"abstract":"A novel design of a circular microstrip antenna patch with an additional patch is presented for achieving circular polarization (CP). A comparison between theory and experimental results gives a good agreement. Sixty four elements of uniform linear array is designed and simulated for achieving CP with more than (20 dB) directivity.","PeriodicalId":319255,"journal":{"name":"2007 2nd International ITG Conference on Antennas","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129695149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-28DOI: 10.1109/INICA.2007.4353922
M. Peter, W. Keusgen, A. Kortke
In this paper, we present the results of a measurement campaign regarding the short range 60 GHz wireless channel. The measurements were performed inside an airplane cabin by the use of a component-based setup covering 1 GHz of bandwidth. We provide the values of fundamental measures like the delay spread of the channel and take a closer look at the structure of the impulse response from a physically-motivated point of view. Using the example of the measured in-cabin channel, we demonstrate an extended versatile evaluation technique to determine the main multipath components (MMPCs) of the channel.
{"title":"Temporal Structure of the 60 GHz Wireless Channel","authors":"M. Peter, W. Keusgen, A. Kortke","doi":"10.1109/INICA.2007.4353922","DOIUrl":"https://doi.org/10.1109/INICA.2007.4353922","url":null,"abstract":"In this paper, we present the results of a measurement campaign regarding the short range 60 GHz wireless channel. The measurements were performed inside an airplane cabin by the use of a component-based setup covering 1 GHz of bandwidth. We provide the values of fundamental measures like the delay spread of the channel and take a closer look at the structure of the impulse response from a physically-motivated point of view. Using the example of the measured in-cabin channel, we demonstrate an extended versatile evaluation technique to determine the main multipath components (MMPCs) of the channel.","PeriodicalId":319255,"journal":{"name":"2007 2nd International ITG Conference on Antennas","volume":"89 17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129766564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-28DOI: 10.1109/INICA.2007.4353945
P. Knott
Conformal antenna arrays fitted to non-planar surfaces on parts of modern aircrafts, vehicles or ships are considered an attractive alternative for many applications whereas planar arrays or reflector antennas have definite drawbacks. Some of the potential advantages are improved aerodynamics, increased payload, large field of view (LFOV) and low observability (LO). However, the usage of conformal array technology in commercial applications is still comparably rare. Recent examples of antenna arrays on curved apertures are typically of cylindrical shape but only exhibit a weak degree of curvature. The present paper describes the development of a spherical antenna array with 95x3 antenna elements, a diameter of 300 mm and an opening angle of 112deg . Since the number of antenna elements on a planar or curved antenna aperture required for high directivity and two-dimensional beam steering can easily become very large, especially if an element spacing around half the free space wave length is required, the antenna elements are arranged in sub-arrays, each carrying 3 circularly polarized patch antennas at a centre frequency of f = 9.5 GHz and a phase corrected feed network on a common substrate. The sub-array is suited for easy integration into antenna arrays with double curved aperture and can be seen as a trade-off between antenna gain vs. beam granularity. Experimental results on antenna matching and radiated far field patterns as well as measured beam forming results will be presented.
{"title":"Design and Experimental Results of a Spherical Antenna Array for a Conformal Array Demonstrator","authors":"P. Knott","doi":"10.1109/INICA.2007.4353945","DOIUrl":"https://doi.org/10.1109/INICA.2007.4353945","url":null,"abstract":"Conformal antenna arrays fitted to non-planar surfaces on parts of modern aircrafts, vehicles or ships are considered an attractive alternative for many applications whereas planar arrays or reflector antennas have definite drawbacks. Some of the potential advantages are improved aerodynamics, increased payload, large field of view (LFOV) and low observability (LO). However, the usage of conformal array technology in commercial applications is still comparably rare. Recent examples of antenna arrays on curved apertures are typically of cylindrical shape but only exhibit a weak degree of curvature. The present paper describes the development of a spherical antenna array with 95x3 antenna elements, a diameter of 300 mm and an opening angle of 112deg . Since the number of antenna elements on a planar or curved antenna aperture required for high directivity and two-dimensional beam steering can easily become very large, especially if an element spacing around half the free space wave length is required, the antenna elements are arranged in sub-arrays, each carrying 3 circularly polarized patch antennas at a centre frequency of f = 9.5 GHz and a phase corrected feed network on a common substrate. The sub-array is suited for easy integration into antenna arrays with double curved aperture and can be seen as a trade-off between antenna gain vs. beam granularity. Experimental results on antenna matching and radiated far field patterns as well as measured beam forming results will be presented.","PeriodicalId":319255,"journal":{"name":"2007 2nd International ITG Conference on Antennas","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128416949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-28DOI: 10.1109/INICA.2007.4353927
A. Kortke
A method is presented to calculate discrete equivalent source current distribution functions from measured electric near field distribution functions. The calculated distribution functions possess a high spatial resolution of about a tenth of the radiated wavelength and therefore permit insight into the functional details of the investigated DUT antennas. Several characteristic parameter can be obtained from the evaluation of the calculated distribution functions. Some examples are presented for linear microstrip antenna arrays.
{"title":"High Resolution Equivalent Source Current Calculation for Planar Antennas","authors":"A. Kortke","doi":"10.1109/INICA.2007.4353927","DOIUrl":"https://doi.org/10.1109/INICA.2007.4353927","url":null,"abstract":"A method is presented to calculate discrete equivalent source current distribution functions from measured electric near field distribution functions. The calculated distribution functions possess a high spatial resolution of about a tenth of the radiated wavelength and therefore permit insight into the functional details of the investigated DUT antennas. Several characteristic parameter can be obtained from the evaluation of the calculated distribution functions. Some examples are presented for linear microstrip antenna arrays.","PeriodicalId":319255,"journal":{"name":"2007 2nd International ITG Conference on Antennas","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123955927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-28DOI: 10.1109/INICA.2007.4353956
J. Hopf, L. Reiter, S. Lindenmeier
In automotive application there is a strong need for compact multifunctional microwave antennas for example for cellular phones, GPS and, in the USA, satellite radio. The mutual coupling between the antennas leads to alterations in the antenna pattern which, in particular with the antenna for the SDARS- satellite system, is not accepted by the providers. In this paper it is shown how the impact of two phone antennas on the SDARS-antenna can be reduced to an negligible amount.
{"title":"Compact multi-antenna system for cars with electrically invisible phone antennas for SDARS frequencies","authors":"J. Hopf, L. Reiter, S. Lindenmeier","doi":"10.1109/INICA.2007.4353956","DOIUrl":"https://doi.org/10.1109/INICA.2007.4353956","url":null,"abstract":"In automotive application there is a strong need for compact multifunctional microwave antennas for example for cellular phones, GPS and, in the USA, satellite radio. The mutual coupling between the antennas leads to alterations in the antenna pattern which, in particular with the antenna for the SDARS- satellite system, is not accepted by the providers. In this paper it is shown how the impact of two phone antennas on the SDARS-antenna can be reduced to an negligible amount.","PeriodicalId":319255,"journal":{"name":"2007 2nd International ITG Conference on Antennas","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124251705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-28DOI: 10.1109/INICA.2007.4353961
U. Saynak, A. Kuştepeli
A square-spiral strip antenna is designed considering the procedure used to obtain log-periodic antennas. Simulation results of the new design are compared with those of the well known and widely used Archimedean spiral antenna in terms of the frequency dependency. The effect of dielectric substrate used to support the antennas is also investigated.
{"title":"A Novel Square-Spiral Strip Antenna","authors":"U. Saynak, A. Kuştepeli","doi":"10.1109/INICA.2007.4353961","DOIUrl":"https://doi.org/10.1109/INICA.2007.4353961","url":null,"abstract":"A square-spiral strip antenna is designed considering the procedure used to obtain log-periodic antennas. Simulation results of the new design are compared with those of the well known and widely used Archimedean spiral antenna in terms of the frequency dependency. The effect of dielectric substrate used to support the antennas is also investigated.","PeriodicalId":319255,"journal":{"name":"2007 2nd International ITG Conference on Antennas","volume":"301 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115900911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-28DOI: 10.1109/INICA.2007.4353933
C. Volmer, J. Weber, R. Stephan, K. Blau, M. Hein
In ordinary antenna arrays the spacing between radiators is usually chosen lambda/2. In order to use antenna arrays in small mobile platforms, the overall dimensions and hence the radiator separation must be reduced, which aggravates the problem of mutual coupling between radiators. Results are highly distorted beam patterns and greatly reduced radiation efficiency. We propose a simple method to design a decoupling and matching network for a three element antenna array with a radiator separation of lambda/4, which excites the orthogonal eigenmodes of radiation of the antenna array.
{"title":"Decoupling and Matching Network for Miniaturised 3-Port Antenna Arrays Based on 180° Couplers","authors":"C. Volmer, J. Weber, R. Stephan, K. Blau, M. Hein","doi":"10.1109/INICA.2007.4353933","DOIUrl":"https://doi.org/10.1109/INICA.2007.4353933","url":null,"abstract":"In ordinary antenna arrays the spacing between radiators is usually chosen lambda/2. In order to use antenna arrays in small mobile platforms, the overall dimensions and hence the radiator separation must be reduced, which aggravates the problem of mutual coupling between radiators. Results are highly distorted beam patterns and greatly reduced radiation efficiency. We propose a simple method to design a decoupling and matching network for a three element antenna array with a radiator separation of lambda/4, which excites the orthogonal eigenmodes of radiation of the antenna array.","PeriodicalId":319255,"journal":{"name":"2007 2nd International ITG Conference on Antennas","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129371325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-28DOI: 10.1109/INICA.2007.4353921
J. Pontes, A. Lambrecht, M. Rutschlin, S. Schulteis, M. Porebska, T. Fugen, W. Wiesbeck
A pattern shaping synthesis method along with a new sidelobe shaping scheme are used to design antenna arrays capable of delivering a much better radiation performance in terms of homogenous coverage and reduced interference with respect to commercial antennas. For verification, radiation within an urban scenario for the region inside and outside the cell has been studied with the aid of a 3D ray-tracing simulator. Results show a 15% radiation reduction outside the cell for the synthesized antenna with respect to commercial antennas under equal coverage conditions.
{"title":"Synthesized Antenna Arrays for Future Mobile Networks","authors":"J. Pontes, A. Lambrecht, M. Rutschlin, S. Schulteis, M. Porebska, T. Fugen, W. Wiesbeck","doi":"10.1109/INICA.2007.4353921","DOIUrl":"https://doi.org/10.1109/INICA.2007.4353921","url":null,"abstract":"A pattern shaping synthesis method along with a new sidelobe shaping scheme are used to design antenna arrays capable of delivering a much better radiation performance in terms of homogenous coverage and reduced interference with respect to commercial antennas. For verification, radiation within an urban scenario for the region inside and outside the cell has been studied with the aid of a 3D ray-tracing simulator. Results show a 15% radiation reduction outside the cell for the synthesized antenna with respect to commercial antennas under equal coverage conditions.","PeriodicalId":319255,"journal":{"name":"2007 2nd International ITG Conference on Antennas","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133510703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-28DOI: 10.1109/INICA.2007.4353939
A. Tzoulis, T. Eibert
In many antenna applications, the environment of the radiating system has a significant effect on the overall radiation of the antenna and should be taken into account in the simulations. The involved objects are often electrically very large, so that numerical techniques combining ray optical asymptotic methods are preferred to handle such configurations. In this contribution, simulation results of electromagnetic radiation problems including environment effects are presented, using the recently developed hybrid method, which combines the Uniform Geometrical Theory of Diffraction (UTD) with the Finite Element Boundary Integral (FEBI) technique and with the Multilevel Fast Multipole Method (MLFMM). Electrically large and simple flat objects in the neighborhood of antennas are treated with UTD, providing full electromagnetic coupling with composite metallic/dielectric arbitrarily shaped FEB! objects. Thereby, double diffracted high-frequency fields on pairs of straight metallic non-coplanar and skewed edges are taken into account using the hard and soft scalar diffraction coefficients of UTD. Also, near-field computations in the postprocessing stage are efficiently accelerated by MLFMM, where ray optical contributions due to the presence of electrically large objects are taken into account according to the hybridization of MLFMM with UTD.
{"title":"Antenna Modeling with the Hybrid Finite Element - Boundary Integral - Multilevel Fast Multipole - Uniform Geometrical Theory of Diffraction Method","authors":"A. Tzoulis, T. Eibert","doi":"10.1109/INICA.2007.4353939","DOIUrl":"https://doi.org/10.1109/INICA.2007.4353939","url":null,"abstract":"In many antenna applications, the environment of the radiating system has a significant effect on the overall radiation of the antenna and should be taken into account in the simulations. The involved objects are often electrically very large, so that numerical techniques combining ray optical asymptotic methods are preferred to handle such configurations. In this contribution, simulation results of electromagnetic radiation problems including environment effects are presented, using the recently developed hybrid method, which combines the Uniform Geometrical Theory of Diffraction (UTD) with the Finite Element Boundary Integral (FEBI) technique and with the Multilevel Fast Multipole Method (MLFMM). Electrically large and simple flat objects in the neighborhood of antennas are treated with UTD, providing full electromagnetic coupling with composite metallic/dielectric arbitrarily shaped FEB! objects. Thereby, double diffracted high-frequency fields on pairs of straight metallic non-coplanar and skewed edges are taken into account using the hard and soft scalar diffraction coefficients of UTD. Also, near-field computations in the postprocessing stage are efficiently accelerated by MLFMM, where ray optical contributions due to the presence of electrically large objects are taken into account according to the hybridization of MLFMM with UTD.","PeriodicalId":319255,"journal":{"name":"2007 2nd International ITG Conference on Antennas","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116944957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-03-28DOI: 10.1109/INICA.2007.4353968
C. Bornkessel, M. Schubert, M. Wuschek, P. Schmidt
The paper summarizes two projects in the framework of the German Mobile Telecommunication Research Program. In the projects, measurement and calculation methods for determination of the general public exposure around GSM and UMTS base stations were developed and applied to a comprehensive analysis of the field distribution in different base station scenarios.
{"title":"Measurement and Calculation of General Public Electromagnetic Exposure Around GSM and UMTS Cellular Base Stations","authors":"C. Bornkessel, M. Schubert, M. Wuschek, P. Schmidt","doi":"10.1109/INICA.2007.4353968","DOIUrl":"https://doi.org/10.1109/INICA.2007.4353968","url":null,"abstract":"The paper summarizes two projects in the framework of the German Mobile Telecommunication Research Program. In the projects, measurement and calculation methods for determination of the general public exposure around GSM and UMTS base stations were developed and applied to a comprehensive analysis of the field distribution in different base station scenarios.","PeriodicalId":319255,"journal":{"name":"2007 2nd International ITG Conference on Antennas","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130177490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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